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Unit 3

Plant Systems

TermDefinition
Photosynthesis Process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.
Chemical Energy Energy stored in the bonds of chemical compounds.
Radiant Energy Energy of electromagnetic waves.
Chlorophyll A green pigment found in plants that they use with light to make food.
Glucose A simple sugar mainly made by plants during photosynthesis from water and carbon dioxide, using energy from sunlight.
Geotropism The turning of all or part of an organism in a particular direction in response to gravity.
Phototropism The turning of all or part of an organism in a particular direction in response to light.
Tropism The turning of all or part of an organism in a particular direction in response to an external stimulus.
Negative Tropism The organism moves away from the stimulus.
Positive Tropism The organism moves toward the stimulus.
Stimulus A detectable change in the internal or external environment of an organism.
External Stimulus Stimulus from outside the organism.
Internal Stimulus Stimulus from within the organism.
Response Any change an organism makes because of a change in the environment.
Turgor Pressure The pressure that water-filled vacuoles exert on the cytoplasm and the elastic cell wall in a plant.
Wilting Water moves out and the plant cells and causes them to become more concave and the plant will loose its rigidity.
Osmosis Water moves in and out of a plant cell through the cell wall.
Reactants Input; the items that go into a chemical reaction.
Products Output; the items that come out of a chemical reaction.
Chloroplasts A structure inside plant cells that absorbs visible light that makes photosynthesis possible.
Sun A form of kinetic energy that travels through space by wave particles, makes life on Earth possible, and can be absorbed, transmitted, or reflected.
Carbon Dioxide A gas that enters the plant and is needed for photosynthesis.
Water A liquid that enters the plant and is needed for photosynthesis.
Oxygen A gas that is release from the plant as a product of photosynthesis.
Plant Cell Eukaryotic cell that has chloroplasts and a cell wall.
Stomata A structure of a plant that is a pore on the under side of the leave that allows the exchange of gases.
Xylem Plant structure in vascular plants that transports water and nutrients from the roots to the leaves of a plant.
Phloem Plant structure in vascular plants that transports food from the leaves to the rest of the plant.
Respiration The chemical process to unlock the energy in the glucose produced by photosynthesis.
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